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TPS65381 - SPI Timings

Andy Kay
Intellectual 765 points


Hi there,

the datasheet (May 2012) of the TPS65381 says on page 38:
- The SDI line is sampled on the falling edge of SCLK.
- The SDO line is shifted out on the rising edge of SCLK

But the timing diagram on page 10 seems to be different:
- Tsusi = setup time at SDI: setuptime of SDI before the rising edge of SCLK
- Td2 = time delay from falling edge of SCLK to data valid at SDO

Which is correct?

Best regards, Andy

  • 0
    TI__Genius 13810 points

    Andy Kay said:

    Hi there,

    the datasheet (May 2012) of the TPS65381 says on page 38:

    HW: Correct
    - The SDI line is sampled on the falling edge of SCLK.
    - The SDO line is shifted out on the rising edge of SCLK

    But the timing diagram on page 10 seems to be different:

    HW: Wrong
    - Tsusi = setup time at SDI: setuptime of SDI before the rising edge of SCLK
    - Td2 = time delay from falling edge of SCLK to data valid at SDO

    HW: This is the latest one I have 8308.Preview Datasheet - TPS65381 - Sept 2012.pdf

    Even in this one, the thlcs is not correct, the min value should be around 750ns, and the highest frequency of SPI fspi should be 5MHz.

    Which is correct?

    Best regards, Andy